What is the main idea of the news item? [originaltext] In July 2012, the worl

In July 2012, the world’s largest AIDS conference comes to Washington, D. C. It’s the first time the gathering will be held in the United States since 1990 and preparations are already underway.
    Despite the massive US financial, medical and scientific contributions to the fight against HIV/AIDS, a major issue blocked the conference from being held here. That was a law that prohibited HIV infected people from traveling to the United States. In was passed in 1987 in the early days of the HIV/AIDS epidemic. Efforts to lift the ban began during President George W. Bush’s second administration. It was finally repealed in January 2010 under President Obama.
    To International AIDS Society President and conference co-chai, Dr. Elly Katabira, that’s very good news.
    Katabira has visited Washington, D. C. to meet with city officials about the 19th International AIDS Conference, also known as AIDS 2012.
    A prominent Washington HIV treatment and care facility, the Whitman-Walker Clinic, says 3 percent of the city’s adult population is confirmed to have HIV. Another 3 to 5 percent are believed to be HIV positive, but have not been diagnosed. Most of the new infections are among African-Americans and gay men.
    The theme of AIDS 2012 is yet to be determined.